65 ILCS 5/9-3-4
The corporate authorities of any municipality may contract for the services of an attorney and an engineer, who shall be members of the committee on local improvements, to prepare the necessary plans, plats, profiles, estimates, specifications, and all other details for any of such improvement. The engineer may be any person registered to practice engineering in the State of Illinois. Such municipality shall provide for the payment for services of the attorney and engineer either from the assessments to be levied against the property benefited to pay the cost of such improvement, or from its general funds, or from the motor fuel tax fund, or from State or Federal funds allocated to the municipality, or from any other available public or private fund, or from any combination of the foregoing sources of funds.
65 ILCS 5/9-3-4